Machine for sharpening harrow-disks



(No Model.)

J. L. SHAW. MACHINE FOR- SHARPENING HARROW DISKS. v

' Patented Apr. 3

ml NAnoriAL. mummy UNITED STATES PATENT OFFICE.

JAMES LEONARD SHAW, OF SENECA, ILLINOIS.

MACHINE FOR SHARPENING HARROW-DISKS.

SPECIFICATION forming part of Letters Patent No. 517,810, dated April 3,1894. Application filed December 12, 1893. Serial No. 493,509- (Nomodel.) I

To all whom it may concern:

Be it known that 1, JAMES LEONARD SHAW, a citizen of the United States,residing at Seneca, in the county of La Salle and State of Illinois,have invented a new and useful Machine for Sharpening Harrow-Disks, ofwhich the following is a specification.

My invention relates to a machine for sharpening harrow-disks, andconsists in certain improvements whereby the machine is adapted tosharpen disks of different sizes.

The invention will first be described in connection with theaccompanying drawings,

and then pointed out in the claims.

Figure 1 is a front elevation of the machine, a portion of each sleevebeing broken away to show the perpendicular posts. Fig. 2 is aperspectiveviewoftheknife-controllingmechanism, detached. Fig. 3isa'perspective view of the base-plate, showing the post and movablesleeves. Fig. 4 is a bottom plan view of the knife-rest, showing themanner of attaching the tool-post thereto.

Referring to the drawings, A represents the longitudinal bars of aframe-work for supporting the device, held at a convenient height bylegs A. Near one end of the bars A, there is securely attached, by meansof bolts 1, a base-plate B having centrally attached thereto a squareperpendicular post 0.

D is a sleeve snugly fitting post 0 and held at any desired height byset-screw 2. On o'pposite sides and at opposite ends of sleeve D,

there are attached journal boxes E and F respectively, as clearly seenin Fig. 3.

On the other end of the bars A there is similarly attached a base-plateB carryinga square perpendicular post 0, said post hav: ing a sleeve D,which is held at any desired height by a set-screw 3 and carries ajournal box E corresponding'in position and size to box E on sleeve D.

In journal box F, there is journaledashaft G, the inner end of whichcarries a sprocket wheel a and the outer end a belt wheel I) or crank 0according as power is to be applied by mechanism or hand.

In the journal boxesE and E, is journaled the central or disk-carryingshaft, on which the disks to be sharpened are placed. This central shaftH, also carries a sprocket wheel d, occupying a position in relation tosleeve D, corresponding to that of wheel a; and connected to the latterby means of an endless chain belt (2.

On the front side of one of the frame-bars A, there is fastened by meansof eye-bolts 4, a guide rod I, carrying a sleeve J. To this sleeve thereis rigidly connected, through the medium of an arm f, the knife-rest K,the under side of which rests squarely on the upper side of frame-bar A.

The tool-post L is placed on the knife-rest K, and has acircular-projection g on its under side which fits into a longitudinalslot h formed in the knife-rest, a concavity i is formed in the underside of the knife-rest K,

to permit a washer j being placed over the oval base resting on theupper surface of knife-rest K and carries two perpendicular tennants Zand m. Pivotally secured between tennants Z and m, is the knife-holderM, the upper end of which carries the knife while the lower end isforked as at 5, to permit the end of lever N, also pivoted between thetennants Z and m, to be placed between the forks 5 of the knife-holder.O is a'weight placed on the other end of the lever and acts, when theknife-controlling mechanism is in place, to hold the knife steadilyagainst the disk being sharpened.

By means of the circular projection g, it is obvious that the tool-postand thereby the knife, can be turned .at any angle to the disk beingsharpened, thus cutting a long or short edge as desired. The circularprojection fitting in the longitudinal slot h of the knife rest K, thetool-post can be moved at different distances from the central shaft h,thus permitting disks of different diameters to be sharpened. 7

By setting the mechanism controlling the movement of the central shaft,which is done by moving the sleeves D and D and holding them in positionby means of the set-screws 2 and 3, and setting the knife at the properdistance, it will be seen that harrow disks of any size can be readilysharpened.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a device for sharpening barrow-disks, a frame-work, a centralshaft mounted thereon, and means for giving the shaft vertical movement,in combination with a knife-rest, a guide for the knife-rest, aknife-carrying tool-post removably attached to said kniferest, and meansfor holding the knife in operative position.

2. In adevice for sharpening barrow-disks, a frame-work, a centraldisk-carrying shaft mounted thereon, and means for vertically movingsaid shaft, in combination with a knife-rest, a guide for theknife-rest, a tool post removably attached to said knife-rest, aknife-holder pivotally connected to said tool-post, and means forholding the knife in operative position.

3. In a device for sharpening barrow-disks, a disk-carrying shaft, andmeans for revolving the same, in combination with, a kniferest, a guidefor the knife-rest,a tool-post removably attached to the knife-rest, aknifeholder carrying a knife at its upper end, a weighted lever pivotedto the tool-post and acting against the lower end of the knifeholder tokeep it in operative position.

In testimony that I claim the foregoing as my own I have hereto aflixedmy signature in presence of two witnesses.

JAMES LEONARD SHAW. Witnesses:

ELMER E. CONKLIN, T. F. MoCoY.

